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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c57a7a0101c0975f86356eed66b38e4986d11fc909ffbee385f26a69c3cd857' 
  AND token = '3KT0Lf9mtMhhG9vC7tjH8J00nln1sEnwscJaNNvP8sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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