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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5509a13acd875d75aa0408c874dd69de425648ff075db8bb4df37a82c34c66c3' 
  AND token = 'NfEHkKM8uMl/Oo/JedewYyVs2JW0vkjbKGY6FEX66xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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