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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcef32c0d270f96baf55340189d910841b7c97aafaa1f019d1e7c32ccc3ca69' 
  AND token = '/FB2gMVkeGr255A5E7j6aNbvR+Wbwc/gXDc4t6PwzIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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