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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b02ad678ef0fee7b9b708c82c98ebb16980373e5200087fa1b8f95d1fe4c01' 
  AND token = 'OZwqxMdikS+3gH1WXwsWfDBbg9EAuMPmdX2uSjmZqPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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