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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ce3210f126d1d53e74bc135f547803e1e6dd50576191dbd0a72bd625713ff2' 
  AND token = 'EKI9dBDPRCFf18sQFt0g6kqvsS874vrf+QqGfFji4eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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