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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b31b1633a9ed7420f7450ea2d7931f91358f414121f16562673555ad47c1736' 
  AND token = 'd3Eo95S2XcodkpsQzxkiwnt2F8SuAdyLDWUET1gNU7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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