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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1ea9637dd4def6344efec9c3845801392e0493af03c46b067ecba8830e2a9f' 
  AND token = 'ZMbIVhTz5D2PdJLa5yH1lwG+Sbhw0TXMXcpSY2/0qaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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