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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266612d047e3609baaf71869e440d6d550ca43ac189ab1319d45c4c94f629cd8' 
  AND token = 'MG2535yBvEIKZQo/rRrU0s5cMNiZSYYYa7Icq9XH2/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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