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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc630c2c7341f072ab42bde168218fe7a9d15c505b222967184936fdd39cd42' 
  AND token = 'MS2o0lzAMVPBxHieuEWDMwt62C5CfkG3PriPD+K2OC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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