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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847abba1b99f39b7549f7f8e4ba538437998bd963ae04ea5cd984bae8788bf1c' 
  AND token = 'Em3aZpA2EvPfpe7D84sDGT4K5p2iYcxpV46yPjn/zFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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