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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b67750c3b0ad81a7aa6ea73df6e5053d9bc8cbaa3072994b016cabe4764cf6' 
  AND token = 'p/Zbv2Reo4dapxgVC//dDhQq91OJjxnZaDYxpNOwRBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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