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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be5fe9ef6e5af7c8662fd011b026a01fa8994d881e6375adcc7fe162b68d00e' 
  AND token = '3CIRDjhpkZusNnbzX21QZCuTXKa3RWh+sC2dr3otatM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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