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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc70771553f1987c345a0eadd3fbb5e8341f3146a2e486799a5363002c4ed0b5' 
  AND token = 'OQbMwX4j5BF8XyghzzKHBoATogyS7RSMWa6JP9NrAu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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