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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4beeacc1917eba6730e107f1da734ffc94a63b1aa778abba8e49be416a1dbc7' 
  AND token = 'REHEmqCd6HK0YTE8GYHuYqi7CSRvARIP3OY87zRZ12A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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