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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d945153176642d1e85d6ceb22621fd5479f224352319270c81c25dc27637b6' 
  AND token = 'c4u/BcYjfWCAR2UrE5Z4zysh+vkwM8A9JNOWbNuKkr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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