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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de6c4c76106b83ded7115404cd22b27f2b2ce03efec6745673d2d46b00bcac5' 
  AND token = 'IPkQsKEy0c3w4AW26/3ceszwVG/x1970AXIm0Y5iLHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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