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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f1e3a5d1d29591b6232d530a7dd91ce96965e9fe477789aab9875a75bf90b2' 
  AND token = 'SA5wLD+6xmDnrHoRthoumOoBsLhwSh4coS0s047ZnrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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