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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6baecf11ec1fb0c5514eef03be746658f3b12debd4f4f0bc67518bb1d4641a12' 
  AND token = 'jvZzoxwyA8ZMTq4jp93awkM5OCEtN1TH4gmGJWxuja8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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