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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db1bfe011eb5ae7b0b9641b0f658a29dfdb676c3f9faf9efc39e90c1192a3d5' 
  AND token = 'nCa92ESWCp+kLWoFy23tjgC1Ppj9B2BCIv3sOgxysoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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