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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe808ce215e7baba80846ec78fc72f9538f390a333a10efe13dc9288ab4e7947' 
  AND token = 'Kghyx2GlYNAKL1OS3/y1G70OgNs31PFjzEbBX9DZakw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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