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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0e3498b953375fd18074240329132bfb892b00934b5b315ca18117b32333cd' 
  AND token = '7IG5gS6hNisAiaHJH5q7aBV4Nx6zV/+B6Lp6JeI88fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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