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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba5d94a888e37d76a6e24b310a3f3e60aa4de525b3e881437974148233e1275' 
  AND token = 'TPvxcgFkLHKQyD7Cs6JqACBwDxR/SwHiQb1Oc1F3/wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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