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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707d0ebb0c56329c2d755af37c0b6f5ca6fc77a537df234b950a67d9817d98da' 
  AND token = 'oL0ue/kfSGTsnHg4/gH0SiwDP1MaqDIwBRcaaZJDkGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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