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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab43f89baf1aeae468c9fe06feba15a8c0ae5ddd463899a33d153cf7412d6e5' 
  AND token = '73XOp1DpQesWPyyf+RHpWM8f9cY+NXq2W5zsHLBe+jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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