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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff16d5554602fcf0e3ad176ad69af636daa87651852c31d5d512c673326b10e' 
  AND token = '8vDmr+heRpVY0FB0Mg2GNgH+o4iiAQr2YFT2x84vNAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}