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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c89065cce8cf1ebeca037001d3be2b0e377096919bd645bf7279b79ce2ba22' 
  AND token = 'kxF/mi4BSFruBvYURpBFOyZ8bqRhvArccz4NgwMijfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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