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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acac388341fa73e2153eeb21404953837a519497ff918c2d5f5665fa22e8f864' 
  AND token = 'cbtrrqxGbBC+2Ypnl68Yu5laiBDj6bdgvGj3jE8cE44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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