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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0daf32fd3f3a0a152792a787aa5d4fdcb2f481931b925635fb417eaa0a4001' 
  AND token = 'LiCy76p3j876grF1hi7LjcCBWC14h0M+aqPsWJk+XdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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