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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9a38e1a41c92f59f29486b5c7273b9e4df529579f33485a4bedf3307c9f041' 
  AND token = 'W8GGrnWDWUoSTehQHRmrPm5OfQCf6+YntI5SSbivA1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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