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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff01bd7ac27d9d0600869d3461de062e68f8682f4420ea74f73fae5d521399f' 
  AND token = 'iu2eBnUIbtG7ZQeTbt6J2WQVaIcGJMpY64r4AzkUlOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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