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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f47edc3852d32af42fd4573e0f71584573e719797c69db58a23a00135a2b4c' 
  AND token = '5KYHpcqtHLjdsD6oG8GqGxF09/TvK9k9wnD+rsCQ7Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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