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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87621bb96a243c362700879818f254b4bf1bf6bc75cb69f51473d1a399f48305' 
  AND token = '8pYAy9Z31XtyUXYHIDD7Z8pTNxFpddrr6usBerEQMHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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