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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c750c8693ff049721ff54d05b301ecbba681d6a1b03bb6a4c2615d93d9790b' 
  AND token = 'SO+l/iiW5Sr1efx17tiLImzh2ogPZdDSda6EONhDxLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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