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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8446622566bd25c80c6eb57f71dfdce1565513c5d4b29e6fcc9151a59c838f' 
  AND token = 'MTSA61oXa7rB+3qe8VuDtP8TEXHHGnkUD2h2gOY2Tsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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