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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58dd3a23fa20ea915eb6087074f780034ae75fc693e45cec19691a3f819bc491' 
  AND token = 'Gpuzry3DDm/5TsE6G+tiO8cwd4unS1eU/8DXmmGPEos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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