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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be29f70c5f303d6455dd6279966c207ce1ec9be6cb3a9740ba750f8d0ffd0460' 
  AND token = 'v90a0GK3mMBhioNpcLEqb5GYOmof2X4/R9+D+nIpMSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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