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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbdc3b15e502973a145705d6d0857f47e8a1eb918ed1c837d26660e23a922738' 
  AND token = 'OFLtAEUP8+y7J+s+zlusugSnO2rr8jBbdep6oo+cBD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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