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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec73c6b6839973ee1168a24339a78a50be31de8d674bd137a77142fbc201f0b' 
  AND token = 'ZpAUjBHf5VvUdai/OiiLdG91ssgveqV5NPVRoCCw3O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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