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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7586f9f515caa65276dd99c3c094045852273906a8576c368fefe27a95971a18' 
  AND token = 'sWV/uCv/JuURWQXgCHH4hlTdAQUu9Qupt5z2t6XzUWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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