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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7123221381412795a5f2822f0401e16b031df1d8a7505f7f22405b09042616' 
  AND token = '+41r59VpSRusLkATJM3MGG5/sYalUFyWIH5S9JS9qmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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