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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd8e8ff1e5f3cdb845785ecea0225109bde32d5b32b7454f5700f46c049f5e9' 
  AND token = 'n9Xo/ZOO0uw8mj273s959GGlgp3ev9QMCFCZeBtqmA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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