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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05bb2f443d8662849ee988005b5f2e12bf83beb52e2b8e57fdbec56f4574a25' 
  AND token = 'hyrB/fAT/u8ZhRgpWcYe0TSzK8981lVJo78PqQ/kyc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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