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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1174acc757fc49c2fbc6515b9696afa997b5e0c4e9316a8e573ccf42edf01243' 
  AND token = 'MpmuhkAmgSUPFRidAFuTm1UZc0FIXsgwXnvkCpNBB/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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