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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda6dcc8a449f624b86080bbd786409620cbc35fd87e86ba3f3a793f66ff6eed' 
  AND token = '6+Xiyj+ABkcv9/sbafoj61JF0ZpP9CMvMiBt90/xusg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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