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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb18aa7621335a2ecbddd6d14aa157dd0485089375fa6376e4d31f3958466c4' 
  AND token = '2h+8hIP3h8TN7HJZNGZrERThp1Jqn1NVRh5hdLAcro4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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