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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43607e31f08a5e8a62bd5d5207a5c1d9697b8b2e1e9e58b7f1db32a3136d1dda' 
  AND token = '86/YeL4YJwnAR9Nkkr+Kiw2UBjrrTB6TdBoHfdFpArI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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