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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4955a1474b0b7f9019900bdd4f4c3145f13f53bcc1f3abf8e71f2abfe98c5e6' 
  AND token = 'Dh1oTlRfOaikT1SU8j79YTC4qcPnAdc31xVASm314Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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