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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5ba8acffcd1c11eb5174bd67e1e943420c93d579b138c8f27bebf2181e8eba' 
  AND token = 'R/C0xeK9ZmN1gJrFmZKi+RIap8r3DhaqaCWJniUPWLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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