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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de94b843a7cfad28f11f8da1e7ab45c485902e772326bb48537cf1f20ff7ce91' 
  AND token = 'rsKsBELrVc9Wzzc2MXjOiTG62kAbIMZrrELpiI3a8IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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