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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9150f601ac211bd68f2b9a8739180919e2775100d324512e1684b0de492975' 
  AND token = '7NJH9/Gqo624NJpEVDS2mEZKNZMyUEpazZbIcN3KhFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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