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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde865a541577a67f828d469a071c3bc7a50b147d208ed07efb6f65f12eadadf' 
  AND token = 'bJZIk17yi/bYVcL+9Z/1MoBrCpXt2CWMulgSwyUWD/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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