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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a65ea7fa4618833de7541f3fbed8ea6c8b04f335c2cb2882bf583e58f63c516' 
  AND token = 'dpR7BHePFXyZW613A7OP0QNmhLghS6RhvbQ+HWffohk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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