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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d0b43432afcf17f1332a1bdb6b23444e05670940a901f200df82c66febc500' 
  AND token = 'b4MAmHLOh7D5VEzx7ODXOCvy603Kzk9h1pXo+lB3lRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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