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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd276f9ec160a6ae2ff7597fc15701dea5db825232c8c33f27532a577f5cf770' 
  AND token = 'f7bM9UWQkj/a2i7K1708oLyLZ5gCqPw2Luo9xcVtLBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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