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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db791200d2be28e295ce5452a2959328247b72e97c76116ea3e20f7b89b5e88' 
  AND token = 'Vdjfzi+DneFnafbjdyF+2yKBXi6k9NEoUv8B0uaoor0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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