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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cc92e993516c2591aa045209572fec160e41948bfbdefaa260e940c47c2b6a' 
  AND token = 'DoV789d5i9Ev4vPGBXDh1hWkVoa7P2ubv2V4sQwgl4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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