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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e761bb68c8fa2d64e7f3e61daf4375db7dc3fcf8be2580db62c6c8581d40a3e' 
  AND token = 'xKXnqJllqL7miBj61OEYE5M11dnvYm4uYaHT7Y9iIiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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