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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817932846aa53a0f28a7d8f1f2db8d3cd44c777444b43c9c31877e30ccf79ed7' 
  AND token = 'qAFGGPIUcqpE1YXRfYlKLE/XMdyVjYIMgkv3/C208VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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