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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7459685754a3cbed76c2d9e82a28ab3e909c1116f2e044a29501ca9be3e18e' 
  AND token = 'TT8XmhhL31NjutBSeY0O9paOUXa4iNw+KYRtXZqHVfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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