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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ea1623d10e6e34d55ce4dc3cd530ca665d0679b9d8c748636e2a0e01aaae41' 
  AND token = 'WUjlDeqxKdXkSe50VQ5VMqS/oz51ixtsMHYF2Z4oJrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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