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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438bea61cee39f39fa6a513d5d631857ab012b58a696405e47f70ab1f7d27516' 
  AND token = 'i4SWD5EM5tbA0wcw20W2Hnb648i0Fv886dlEjTHs3YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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