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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f619d49f91cd991ee552f5a670151b2183504226151b2c4f37d11127824db7f0' 
  AND token = 'tXS+Kx1Y447I59kpTFDR9512nLWkKWJ7NCB/9j5KAhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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