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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8e9a91333cdb58ba19a3a90820038ef7e32d292aade5dc2d66486199498575' 
  AND token = 'cLRa1oJvlAr9Ivw/TQlA6GanshT/8LeFxxeTdpzLCEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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