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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6e0f37ef612ce3a7b030b4a8ff941fc620a9f68376329ebea2b55c58d10873' 
  AND token = 'U6sAl8olL3bq4G1kbqjQLDCUO3oAkVkOO6t6Ygxu0LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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